Help Needed: Flowerhorn with Partially Open Mouth, Swollen Stomach, and Shrunken Kok

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All Sev

Black Skirt Tetra
MFK Member
Jun 28, 2024
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Hi everyone,

I’m seeking advice on a flowerhorn I’ve been observing. This fish was bought by a friend around 3 months ago. I saw an old video from 2 months back where the fish already had a partially open mouth, and now it’s still the same — the mouth doesn’t fully close, but the fish is eating and active.

Now, I’ve noticed additional issues:
  • A slightly swollen stomach (not pineconed, but looks distended — circled in image).
  • A shrinking or undeveloped kok.
  • When the fish opens its mouth, there seems to be something visible inside, like tissue or a mass — not sure if it’s abnormal or just gill structure.
The fish is housed alone, active, and eats, but something seems off.
  • I’ve attached photos showing the jaw, stomach swelling, and head for reference.
❓ What I Want to Know:
  • Is this partially open mouth due to an deformity, or something inside the mouth or bacterial infection?
  • Could the stomach swelling be internal infection, bloat, or tumor?
  • Is the shrinking kok a sign of stress, poor nutrition, or illness?
  • Any ideas on what that structure inside the mouth could be?
Would appreciate any advice or similar experiences from fellow FH keepers. Thanks in advance!

kno4te kno4te
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Deadeye Deadeye
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@hyb

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